| North Potomac to Opole | 4,399.65 mi (7,080.56 km) |
| North Potomac to Orzesze | 4,448.82 mi (7,159.68 km) |
| North Potomac to Osowa | 4,290.28 mi (6,904.53 km) |
| North Potomac to Ostroda | 4,367.87 mi (7,029.41 km) |
| North Potomac to Ostroleka | 4,446.93 mi (7,156.64 km) |
| North Potomac to Ostrow Mazowiecka | 4,468.44 mi (7,191.27 km) |
| North Potomac to Ostrow Wielkopolski | 4,361.15 mi (7,018.60 km) |
| North Potomac to Ostrowiec Swietokrzyski | 4,519.22 mi (7,272.98 km) |
| North Potomac to Ostrzeszow | 4,373.54 mi (7,038.54 km) |
| North Potomac to Oswiecim | 4,470.69 mi (7,194.88 km) |
| North Potomac to Otwock | 4,470.82 mi (7,195.09 km) |
| North Potomac to Ozarow Mazowiecki | 4,450.37 mi (7,162.17 km) |
| North Potomac to Ozimek | 4,409.99 mi (7,097.19 km) |
| North Potomac to Ozorkow | 4,404.19 mi (7,087.85 km) |
| North Potomac to Pabianice | 4,419.06 mi (7,111.79 km) |
